Optical bonding is the process of filling the air gap between the LCD and glass with an adhesive or resin, such as silicone. Once cured, the silicone adds multiple benefits to the bonded display such as light refraction (from both LCD back-light and outside light), durability against vibration, water, and dust resistant, improved touchscreen accuracy, and prevents fog and condensation in humid environments.

When LCD displays are manufactured, including touchscreens, the front glass of the screen is layered onto the LCD module. This doesn’t present a problem in standard viewing environments, however in certain conditions, like with outdoor placement, the tiny gap between the 2 layers can impair viewing performance.

REDUCES REFRACTION & GLARE

The light passes through the bonded layers and is absorbed somewhat into the screen, therefore important in making screens sunlight readable.

INCREASES
DURABILITY

Additional resin layer in optical bonding absorbs shock and provides high durability for use in public access areas, factories, or other harsh environments.

PREVENTS
CONDENSATION

Condensation can cause screens to become foggy from moisture that penetrates the air gap. Filling of the gap prevents this problem from arising.

INCREASES TOUCH
ACCURACY

Helps maintain a more accurate touch response because the pressure is maintained through the substrate, rather than being delayed by a gap.

MILITARY & DEFENSE

Shock and vibration resistive, extreme durability and accurate touch sensitivity are very important in mission critical military applications.

MARINE USE

Moisture and dust, as well as shock and vibration protection makes optical bonding a perfect solution for any marine application.

OIL & GAS

High touch accuracy and increased durability, along with dust and moisture protection are perfect for applications in the oil and gas industry.

OUTDOOR DISPLAYS

Low refraction and glare and protection against dust and condensation, make optical bonding a necessity for outdoor displays and HMI.

TRANSPORTATION

Shock and vibration resistance, increased visibility and durability are perfect for any rail or transportation application.

Silicone

Silicone’s core properties of low conductivity and chemical reactivity, thermal stability, and ability to repel water and form watertight seals make it a common solution for optical bonding. It can form debris particles around the edges if damaged. To reduce this the edges are sealed and not exposed.

Epoxy

Epoxy makes a much more rigid bond than silicone, but does not have the tendency to form particulate debris. It is not reworkable in the event any problems arise during production or use.

Polyurethane

Polyurethane adhesives possess good environmental integrity for use in high altitudes and may be superior at low temperatures. It does exhibit a yellowing over time when exposed to high solar lighting conditions.